package com.macro.mall.common.util;

import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.servlet.http.HttpServletRequest;

/** 请求工具类 Created by macro on 2020/10/8. */
public class RequestUtil {

  /** 获取请求真实IP地址 */
  public static String getRequestIp(HttpServletRequest request) {
    // 通过HTTP代理服务器转发时添加
    String ipAddress = request.getHeader("x-forwarded-for");
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getHeader("Proxy-Client-IP");
    }
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getRemoteAddr();
      // 从本地访问时根据网卡取本机配置的IP
      if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
        InetAddress inetAddress = null;
        try {
          inetAddress = InetAddress.getLocalHost();
        } catch (UnknownHostException e) {
          e.printStackTrace();
        }
        ipAddress = inetAddress.getHostAddress();
      }
    }
    // 通过多个代理转发的情况，第一个IP为客户端真实IP，多个IP会按照','分割
    if (ipAddress != null && ipAddress.length() > 15) {
      if (ipAddress.indexOf(",") > 0) {
        ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
      }
    }
    return ipAddress;
  }
}
